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ocfs2: optimize the reading of heartbeat data

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Reading heartbeat data from lowest node rather than from zero, in cases
where the node is not defined from zero, can reduce the number of sectors
read.

Here is a simple test data obtained with 'iostat -dmx dm-5 2', with
two nodes in the cluster, node number 10, 20, respectively.

Before optimization:
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
dm-5              0.00     0.00    0.50    0.50     0.01     0.00    11.00     0.00    1.00    1.00    1.00   1.50   0.15

After the optimization:
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
dm-5              0.00     0.00    0.50    0.50     0.00     0.00     6.00     0.00    0.50    1.00    0.00   0.50   0.05

Link: http://lkml.kernel.org/r/99fe4988-69ac-3615-a218-3042fe6fbe72@huawei.com
Signed-off-by: Jia Guo <guojia12@huawei.com>
Reviewed-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Yiwen Jiang <jiangyiwen@huawei.com>
Acked-by: Joseph Qi <jiangqi903@gmail.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jia Guo 2018-12-28 00:32:35 -08:00 committed by Linus Torvalds
parent a9ee3a63db
commit 874b1ef0ef
1 changed files with 12 additions and 5 deletions
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17
fs/ocfs2/cluster/heartbeat.c
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@ -582,9 +582,10 @@ bail:
}
static int o2hb_read_slots(struct o2hb_region *reg,
unsigned int begin_slot,
unsigned int max_slots)
{
unsigned int current_slot=0;
unsigned int current_slot = begin_slot;
int status;
struct o2hb_bio_wait_ctxt wc;
struct bio *bio;
@ -1093,9 +1094,14 @@ static int o2hb_highest_node(unsigned long *nodes, int numbits)
return find_last_bit(nodes, numbits);
}
static int o2hb_lowest_node(unsigned long *nodes, int numbits)
{
return find_first_bit(nodes, numbits);
}
static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
{
int i, ret, highest_node;
int i, ret, highest_node, lowest_node;
int membership_change = 0, own_slot_ok = 0;
unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)];
unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
@ -1120,7 +1126,8 @@ static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
}
highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES);
if (highest_node >= O2NM_MAX_NODES) {
lowest_node = o2hb_lowest_node(configured_nodes, O2NM_MAX_NODES);
if (highest_node >= O2NM_MAX_NODES || lowest_node >= O2NM_MAX_NODES) {
mlog(ML_NOTICE, "o2hb: No configured nodes found!\n");
ret = -EINVAL;
goto bail;
@ -1130,7 +1137,7 @@ static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
* yet. Of course, if the node definitions have holes in them
* then we're reading an empty slot anyway... Consider this
* best-effort. */
ret = o2hb_read_slots(reg, highest_node + 1);
ret = o2hb_read_slots(reg, lowest_node, highest_node + 1);
if (ret < 0) {
mlog_errno(ret);
goto bail;
@ -1801,7 +1808,7 @@ static int o2hb_populate_slot_data(struct o2hb_region *reg)
struct o2hb_disk_slot *slot;
struct o2hb_disk_heartbeat_block *hb_block;
ret = o2hb_read_slots(reg, reg->hr_blocks);
ret = o2hb_read_slots(reg, 0, reg->hr_blocks);
if (ret)
goto out;